Wednesday, July 24, 2013

1307.5904 (M. Lisa Manning et al.)

Universality of vibrational modes in the boson peak and random matrices    [PDF]

M. Lisa Manning, Andrea J. Liu
The density of vibrational states for glasses and jammed solids exhibits universal features, including an excess of modes above the Debye prediction known as the boson peak, located at a frequency \omega*. We show that the eigenvector statistics for modes in the boson peak are universal and emerge from the interplay of disorder and force balance in the dynamical matrix. We demonstrate that a very large class of random matrices contains a band of modes with this same universal structure, and conjecture the existence of a new universality class. We characterize the eigenvector statistics as a function of coordination number, and find that one member of this new class reproduces the scaling of \omega* with coordination number that is observed near the jamming transition.
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